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Saturday, September 5, 2026

September 5, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 5, 2026 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SATURDAY, SEPTEMBER 5, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0514E
SUNSET:  1811E

SUNSHINE TO START THE DAY, THEN CLOUDS INCREASED WITH A FRESHENING
ONSHORE FLOW….

We started the day with mainly clear skies and plenty of sunshine,
however a backdoor cold front slipped through after 7am and
clouds quickly followed along with a freshening onshore flow. A
few rain showers have also popped up across the area, one of which
passed over the Hill within the last hour, but it was very light
and wasn’t even enough to wet the ground.

Temperatures briefly rose into the low 70s this morning, but have
since slipped back into the mid 60s thanks to the combination of
the clouds and wind off the ocean. Dew point values have been
holding right around 60F throughout the day so far.

Winds were northwesterly during the overnight period, becoming
north and then east-northeast during the morning hours. The
average speed for the day so far is around 10mph. It has been
gusty at times since around 9am. The peak gust so far is 24mph,
which occurred just after 1pm.

Visibility has been decent most of the day with a view of around
50 miles. It has been impacted a bit off to the west-southwest
through the north early this afternoon due to some rain showers
that have developed across the area.

The maximum temperature so far today is 71F, which is 6 degrees
below the normal high of 77F. The minimum temperature since
midnight is 60F, which is 1 degree above the normal low of 59F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus/castellanus
Temperature: 64F; Dew Point: 59F; Relative Humidity: 85%
Wind: NNW @ 7 kts
Sea-level pressure: 1009.9 mb; 29.82 in. Hg: rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 64F
6-hr Min temp: 60F
24-hr Precip: 0.00 inches
BHO SA 1155 70 SCT 50 099/64/59/3407/982/ 8/080 53009 10064 20060

10 A.M.
Weather: Overcast stratocumulus, few breaks in overcast all quadrants
Temperature: 69F; Dew Point: 60F; Relative Humidity: 74%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1010.6 mb; 29.84 in. Hg: rising, then more slowly
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E43 OVC 50 106/69/60/0405/984/ FEW BINOVC ALQDS
HIER CLDS VSBL ALQDS WND LGT/ 8/5// 51007

1 P.M.
Weather: Scattered stratocumulus, broken cumulus, broken altostratus,
virga distant WSW-N
Temperature: 67F; Dew Point: 60F; Relative Humidity: 80%
Wind: ENE @ 12G19 kts
Sea-level pressure: 1011.5 mb; 29.87 in. Hg: steady, then rising
Visibility: 50 miles, intermittently lower WSW-N
6-hr Max temp: 71F
6-hr Min temp: 64F
6-hr Precip: Trace
BHO SA 1755 25 SCT E41 BKN 60 BKN 50 115/67/60/0712G19/987/
VIRGA DSNT WSW-N RW-B33E41 VSBY INTMTLY LWR WSW-N/ 8/760 53009 6000/
10071 20064

————————————————————–

SUMMARY FOR FRIDAY, SEPTEMBER 4, 2026

TEMPERATURE (DEGREES F)
MAX…….84   NORMAL…..77
MIN…….63   NORMAL…..59
MEAN……74   NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+6
TOTAL DEPARTURE FOR THE MONTH (SEP)………………….-3 [-1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH (SEP)………..2  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………….5  DEPARTURE…….-17
TOTAL HEATING UNITS LAST SEASON TO DATE……….21  DEPARTURE…….-16

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..9  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH (SEP)……….13  DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE SEASON…………..767  DEPARTURE……+153
TOTAL COOLING UNITS LAST SEASON TO DATE………682  DEPARTURE…….+85

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..24 NNW  @   04:40 P.M.
VECTOR #1 (1-Sec)……….25 NNW  @   04:34 P.M.
VECTOR #2 (1-Sec)……….25 NW   @   04:36 P.M.
DAVIS #1……………….22 NNW  @   04:34 P.M.
DAVIS #2 ………………21 NW   @   04:01 P.M.
RMY #1 (Instantaneous)…..24 NNW  @   04:34 P.M.
RMY #2 (Instantaneous)…..24 NW   @   04:36 P.M.
MERLIN…………………23 NW
RICHARDS (C5C) (Inst)……22 NNW  @   04:34 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NW   @   03:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NW   @   02:51 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 WNW  @   02:04 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NW   @   02:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 WNW  @   02:04 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 NW   @   02:52 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 NW   @   02:51 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 NW   @   02:52 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.3 NW [198 total miles] VECTOR #1………………8.5
VECTOR #2………………8.9
DAVIS #1……………….8.5 NW
DAVIS #2…………………M
RMY #1…………………8.5 NW
RMY #2…………………8.6 NW
RICHARDS (C5C)………….8.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH (SEP)……..0.66 DEPARTURE…..+0.20
TOTAL PRECIPITATION FOR THE YEAR (2026)…….26.65 DEPARTURE…..-8.42

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

9/1  69/57/63/-6/0.21/…/..             15 SSW VEC1 15 E   RMY 14
9/2  76/58/67/-2/0.00/…/..             21 ESE VEC1 21 ESE RMY 20
9/3  74/60/67/-1/0.45/…/..             24 SSE VEC1 24 SSE RMY 23
9/4  84/63/74/+6/0.00/…/..             24 NNW VEC1 25 NNW RMY 24

9/5 The low since midnight is 60F, the daily normal low is 59F.

————————————————————–

SEPTEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900, 2018
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

TODAY’S REPORT PREPARED BY: Matt Douglas

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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